Humminbird Side Imaging Forums

Side Imaging Forums => 997c SI, 998c SI & 999ci HD SI => Topic started by: fishmanmike on March 14, 2010, 08:16:10 PM

Title: SI interference
Post by: fishmanmike on March 14, 2010, 08:16:10 PM

I got my 998c si installed and it works well. I am having trouble though when I run my trolling motor at low rpms. I get severe interference on the side scan and down scan screens. If I increase the rpm's the interference goes away. I don't get any interference from my primary motor. Any ideas on how to resolve this?
 
 

Title: Re: SI interference
Post by: bobcoy on March 14, 2010, 08:49:27 PM

More than likely it is RF interference. Most trolling motors use pulse width modulation and unless you put them on full power they put out radio waves that show up on your depth finder as lines or just a solid blob of interference. If you call support they will probably send you an interference kit. It helped me out with my Minn Kota interference. Bob

Title: Re: SI interference
Post by: fishmanmike on March 14, 2010, 09:09:51 PM

Thanks for the reply, I will give that a try.

Title: Re: SI interference
Post by: fishmanmike on March 15, 2010, 04:27:15 PM

I guess i need to clarify my statement. My trolling motor is a mercury 9.9 outboard. It has resistor plugs in it.
 I talked with Humminbird and verified tha I have nickle insulated transducer wires. They are tryin gto tell me it is turbulance but I know that is not correct. I should be recieving my sd card today or tomorrow so hopefully I can get back up to the lake to get some snapshots of the screen to send them.

Title: Re: SI interference
Post by: Jolly Roger on March 15, 2010, 04:32:06 PM

Mike,
can you post some pictures of the transducer location (from side and rear/front) and where the TM is mounted. I guess you got the transducer on the transom and the TM on the bow, right?

Regards / Harry

Title: Re: SI interference
Post by: fishmanmike on March 15, 2010, 07:12:08 PM

(http://i110.photobucket.com/albums/n85/fishmanmike/fishing/IMG_1519.jpg)
(http://i110.photobucket.com/albums/n85/fishmanmike/fishing/IMG_1518.jpg)
(http://i110.photobucket.com/albums/n85/fishmanmike/fishing/IMG_1517.jpg)
(http://i110.photobucket.com/albums/n85/fishmanmike/fishing/IMG_1516.jpg)
Here are some picts of the transducers. You can see the Black Mercuy outboard shaft is well aft of the left transducer

Title: Re: SI interference
Post by: RGecy on March 15, 2010, 07:21:05 PM

Mike,

Some pictures/snapshots of what you are seeing on the screen will help a lot! 

Like the boat!  ;D

Robert

Title: Re: SI interference
Post by: fishmanmike on March 15, 2010, 07:37:53 PM

Thank You, I just recieved my sd card in the mail today and figured out how to work the snapshots on the simulator and save them in my computer. Now I just have to find time to get back up to a lake to get some samples of what is going on.

Title: Re: SI interference
Post by: Humminbird_Greg on March 16, 2010, 05:41:24 PM

It could be motor noise interference instead of RF-trolling motor interference.  Try some of the suggestions shown here on the web site:
http://www.humminbird.com/support/FAQ.aspx?faqtopic=17 (http://www.humminbird.com/support/FAQ.aspx?faqtopic=17)

Title: Re: SI interference
Post by: fishmanmike on March 16, 2010, 09:55:16 PM

Well, as far as my office is concerned, I had a very important meeting to go to this afternoon. Which really meant I got up to the lake to get some screen captures. I methodically turned things on or off and realized it is my TR-1 auto pilot causing the problem . It creates no interference in standby but when it is steering ,that is when I get the problem. What can I possibly do to correct this?
(http://i110.photobucket.com/albums/n85/fishmanmike/IMG_1520.jpg)
(http://i110.photobucket.com/albums/n85/fishmanmike/interference.png)
<a href="http://s110.photobucket.com/albums/n85/fishmanmike/?action=view&current=noisefilterhigh.png" target="_blank"><img src="http://i110.photobucket.com/albums/n85/fishmanmike/noisefilterhigh.png" border="0" alt="noise filter high">[/url]
<a href="http://s110.photobucket.com/albums/n85/fishmanmike/?action-view&current=noisefilterhigh.png" target="_blank"><img src="http://i110.photobucket.com/albums/n85/fishmanmike/noisefilterhigh.png" border="0" alt="noise filter high">[/url]
(http://i110.photobucket.com/albums/n85/fishmanmike/onoffautopilot.png)

Title: Re: SI interference
Post by: fishmanmike on March 16, 2010, 09:57:11 PM

Picture 2 shows the interference, Picture 3 shows turning the autopilot from active to standby.

Title: Re: SI interference
Post by: sonar2000 on March 17, 2010, 08:21:50 AM

Mike, is the jet drive running when this happens.  Chuck

Title: Re: SI interference
Post by: Humminbird_Greg on March 23, 2010, 10:51:18 AM

Fishmanmike,
You can try isolating the Humminbird and the Autopilot from each other: route any cables as far away from each other as you can.  Power them off of separate batteries.  Although made for interference from trolling motors the trolling motor interference kit from Humminbird may help with this.  Give them a call at 1-800-633-1468 and see if they can get one shipped out to you.

Title: Re: SI interference
Post by: fishmanmike on March 23, 2010, 05:50:57 PM

Thanks Greg, I e-mailed the same photos to Ms. Smith at Humminbird so hopefully she will respond soon. Mike